Explanation:

There are 4 key terms that are emerging in the discourse of nanotechnology: Nanobacteria: Nanobacteria are nano-sized in that they are from 20—200 nanometres (run) in size and are the smallest known self-replicating bacteria.
Nanoemulsion: Nanoemulsions are a class of extremely small droplets that appear to be transparent or translucent with a bluish colouration. They are usually in the range 50 to 200 nm but much smaller than the range (from 1 to 100 pm) for conventional emulsions.
Nanog: Nanog is a key pluripotency regulator critically important in the process of self-renewal of undifferentiated stem cells. It is encoded by the NANOG gene.
Nanogels: Nanogels are composed of cross-linked three-dimensional polymer chain networks that are formed via covalent linkages or self-assembly processes